NASA on Tuesday said it had picked SpaceX to build a vessel to carry the International Space Station back through Earth's atmosphere and on to a final resting place in the Pacific Ocean after it is retired in 2030.
Space Exploration
Jun 27, 2024
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644
Huaguang Reef, one of the expansive atolls in the Xisha Islands, is completely mature, stretching 31 kilometers from east to west and 12 kilometers from north to south. Positioned as a concealed reef in the water, only the ...
Ecology
Jun 25, 2024
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The unpredictability of sport is in many ways its greatest attraction, and unforgettable come-from-behind victories are especially captivating.
Social Sciences
Jun 21, 2024
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New research has revealed a new way to measure incredibly minute forces at the nanoscale in water, pushing the boundaries of what scientists know about the microscopic world.
Bio & Medicine
Jun 21, 2024
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As more organizations attempt to increase the representation of women in traditionally male-dominated occupations (such as engineering, technology or banking), new research from George Washington University professor Jennifer ...
Social Sciences
Jun 19, 2024
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The so-called Casimir force or Casimir effect is a quantum mechanical phenomenon resulting from fluctuations in the electromagnetic field between two conducting or dielectric surfaces that are a short distance apart. Studies ...
For centuries, the transport sector has been one of the biggest contributors to global carbon emissions. To address the problem, many research groups are now actively exploring how technology can help transport systems to ...
Superconductivity
Jun 17, 2024
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3
Disease-causing microbes have evolved sophisticated strategies for invading the body, flourishing in often hostile environments and evading immune defenses. In a new study, Professor Cheryl Nickerson, her Arizona State University ...
Cell & Microbiology
Jun 17, 2024
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NOAA is forecasting an above-average summer "dead zone" in the Gulf of Mexico covering approximately 5,827 square miles—an area roughly the size of Connecticut. The dead zone, or hypoxic area, is an area of low oxygen that ...
Earth Sciences
Jun 14, 2024
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25
Research teams led by Prof. Zeng Changgan and Zhang Hui from the Hefei National Laboratory for Physical Sciences at the Microscale, the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences ...
Condensed Matter
Jun 13, 2024
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93
In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses, a technical term for influences which cause deformation of matter. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.
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